Παραπομπή APA

Kerr, J. R., & Littlefield, J. E. Marketing: An environmental approach.

Παραπομπή Chicago Style

Kerr, John R., και James E. Littlefield. Marketing: An Environmental Approach.

Παραπομπή MLA

Kerr, John R., και James E. Littlefield. Marketing: An Environmental Approach.